Rotary gumming attachment for envelope folding machines of the plunger type



March 15, 1938. o. G. DREHER ET AL ROTARY GUMMING ATTACHMENT FORENVELOPE FOLDING MACHINES OF THE PLUNGER TYPE 1 Filed Nov. 3, 1934 4sheets sheet 1 Mafch 15, 1938. o; G. DREHER ET' AL 2,111,317

ROTARY GUMMING ATTACHMENT FOR ENVELOPE FOLDING MACHINES OF THE PLUNGERTYPE Filed Nov. 3, 1934 4 Sheets-Sheet 2 INVENTOR Qfwfw .2. 1flQATI'ORNEY Mar 15, 38- o. G. D'REHER ET A1. 2,11 .31?

ROTARY GUMMING ATTACHMENT FOR ENVELOPE FOLDING MACHINES OF THE PLUNGERTYPE Fi1ed'Nov.'3, 1934 4 Shets-Sheet 5 JM ATTORNEY March 15, 1938. O G.DREHE T AL 2,111,317

ROTARY GUMMING ATTACHMENT FOR ENVELOPE FOLDING MACHINES OF THE P IJUNGERTYPE Filed Nov. 3, 19'34 4 Sheets-Sheet 4 INVENTORS',

ym A '4 $4, ATTORNEY Patented Mar. 15, 1938 7 provide means forautomatically maintaining the leading ends of the blanks in apredetermined ROTARY GUDIMING ATTACHMENT FOR ENVELOPE FOLDING MACHINESOF THE PLUNGER TYPE I Omer G. Dreher, Miamisburg, and Charles 'll.Arnold, West Carrollton, iDhio, assignors to The American EnvelopeCompany, West Carrollton, Ohio, a corporation of Ohio ApplicationNovember 3, 1934, Serial No. 751,390

6 Claims.

This invention relates to new and use ul improvements in rotary-gummingattachments for envelope folding machines of the plunger type.

One of the principal objects of our invention is to provide a roll sealfor applying gum to envelope blanks for the purpose of preventing anaccumulation of gum at the ends of the seal flap. Under the presentmethod of applying gum to envelope blanks, it accumulates in harmfulwads at the end of the seal flaps; but under our meth-.

0d of rolling the gum in, such a result will not ensue. Furthermore, ourroll seals extend over the edge of the paper to apply the gum all theway over the edge of the seal flap.

Another main object of our invention is to provide vacuum nozzle meansthat co-act with cupped feed cylinders from which sections have beenremoved to permit the nozzle-to pull the lower end of the topmost blankwell into the pinch between the cylinders.

It is still another object of our invention to position to cause thestack to be moved toward the feed cylinders by the elevator mechanism.

Another object of our invention is the provision of transfer chains formoving the blanks through the gumming station to the creasing-box in anaccurately alined manner.

A further object of our invention is the provision of means forautomatically applying gum of the proper kind to a respective pad on thepad cylinder without depositing any of that gum on the wrong pad. Forinstance, non-acid gum is applied only to the seal-flap pad by the gumroll bearing that kind of gum; said pad being moved back out of the pathof the back pad by acam when that pad passes that roll. And i when theseal-flap pad passes the back gum roll, the latter is moved rearwardlyout of its path by a similar cam. However, the proper roll isspring-pressed into engagement with its respective pad to apply gumthereto when it crosses the path of that pad.

It is a further object of our invention to provide means forcontinuously maintaining in a clean condition, the cylinder over whichthe envelope blanks travel while being gummed. Gum must be removed fromthis cylinder-lest the blanks adhere to it. i

Another object of our invention is the provision of a stripper blade tostrip the envelope blanks from the gum pads to which they tend toadhere. Suitable mechanism is provided to move this blade backward andupward while the stripped blanks are moved forward by the transferchains whose gripper blocks 'still continue in gripping engagement withthe rear ends of the blanks after their leading ends are stripped fromthe gum pads.

' It is another object of our invention to provide locating fingerswhich are adapted to move through an arc to accurately locate eachadvanced blank over the creasing box after it has been approximatelyplaced thereon by the transfer chains.

Other important and incidental objects will be brought forth inthefollowing specification and particularly set forth in the subjoinedclaims.

In the accompanying drawings illustrating our invention, Figure l is aside view of our envelope feeding machine, showing our vacuum feed and.rotary gumming attachment secured thereto. Figure 2 is a top plan viewof said attachment. Figure 3 is an enlarged, vertical sectional viewtaken through the same. Figure 4 is a crosssectionalview taken throughthe attachment on the line 4-4 of Figure 3, showing the feed rolls.Figure 5 is a detail view of the mechanism for keeping the leading endsof the blanks at a predetermined position. Figure 6 is a skeleton viewof an envelope blank supported by the guide rods. Figure I is a viewlooking into the discharge end of the gummer attachment, showing thegripper chains and locators for the blanks. Figure 8.

is a longitudinal, sectional view taken on the line 8-8 of Figure 7,showing the stripper blades, locators and associated mechanism. Figure 9is a partial view of the left side of the machine, showing the drivingmechanism. Figure In is a perspective view of one of the gripper blocks.Figure 11 is a plan view of the same. Figure 12 is lit a cross-sectionalview taken through one of the chain channel-guides. Figure 13 is a planview of the vacuum control means for the vacuum nozzles, and Figure 14is alongitudinal sectional view taken on the line "-44 of Figure 13.

Referring to the accompanying drawings for a detailed description of ourinvention, the numeral I designates an envelope folding machine of aconventional type having a table 2. Adapted to be secured to this tableis a vacuum feed and rotary gumming attachment comprising a main' frame3 from which side rails 4, 4 project rearwardly. Extending between theserails is a lower cross member 5 which carries two brackets 6, 6terminating in grooved, right-angle extensions I which support tworearwardly projecting guide vator plate III, which is advanced by twoscrews II, II sustained by a cross bar I2 secured to its side rails 4,4.

The elevator plate I carries two bracket members I3, I3, one for eachscrew II. Each bracket member I3 is formed at its upper end with asleeve portion I4 through which a respective screw II freely projects.To the upper end of each bracket member I3 there is pivotally secured alever arm I5. Pivotally secured to the inner end of each lever arm is adepending member I6 having a semi-circular lower end formed with threadswhich engage the threads on its respective screw II, after it passesdownwardly through a hole in the bracket member. Since the threadedmember I6 is stationary, the screws II, II, when rotated, will movetheelevator plate I0 either forwardly to advance the blanks 9, orrearwardly away from them. Attached to the lever arms I 5 is a handle I!which maybe depressed to raise the toothed members I6 above theirrespective screws II to permit the elevator plate to be freely movedbackward or forward without turning the screws.

For the purpose of preventing the envelope blanks 9 from being displacedupwardlyjwe have provided two rods I8, I8. These rods are carried byarms I9, I9 which depend from a cross bar secured to the side rails 4,4. (See Figures 2 and 3.)

When blanks are removed from the leading end of the blanks 9, it isnecessary to maintain this leading end at a predetermined position. Thisis accomplished by the mechanism shown in Figure 5. Mounted on a crossshaft 2I journaled in bearings supported by the side rails 4, 4 is a cam22. Fast on the outer end of the shaft 2I for the purpose of driving thesame, is a sprocket 2 I which receives a sprocket chain 2 I that passesaround a sprocket 2I secured to the drive shaft 2I of the envelopefolding machine. A yoke 23 on the outer end of a connecting rod 24straddles the shaft 2I, said rod carrying a roller 25 which is inengagement with the cam.

Journaled in bearings supported by the side rails 4, 4, in a positionabove and at the rear of the shaft 2I, is a cross shaft 26 on which aratchet wheel 21 is fast. Loosely mounted on this shaft 2I is an arm 28to which one end of a pawl 29 is pivotally secured by a screw 30. Formedon the lower surface of this pawl, at its middle portion, is aprojection 3| for engagement with the teeth of the ratchet.

When the rod 24 is reciprocated by the cam 22, it will oscillate the arm28 about the shaft 26; and since the pawl 29 is carried by the arm, itwill rotate the shaft through its engagement with the ratchet wheel 21.Pinned to the shaft 26 are two spiral gears 32, 32 which mesh with twospiral gears 33, 33 pinned to the screws I I I I respectively.Therefore, the rotation of the shaft 26 will cause the elevator'plateIII to be moved forwardly by the screws to advance the blanks 9.

The leading ends of the blanks 9 are maintained at a predeterminedposition by an arm 34 pinned to a shaft 35 journaled in bearings carriedby the side rails 4, 4. shaft 35 is an arm 36 connected by a link 31 tothe arm 23. Therefore an oscillating movement of the arm 23 will causean oscillation of the arm 34. It is now apparent that if the blanks9.were

in advance of their predetermined position, the

arm 34 would strike their leading ends and prevent the cam roller 25from reaching the short diameter of the cam 22. This shortened St k Alsopinned to the of the arm 23 would prevent the pawl 29 from engaging thenext tooth of the ratchet 21, whereupon the blanks 9 will] not feedforward. However, if the leading ends of the blanks were behind theirpredetermined position, the arm 34 would not contact them. Consequently,the cam roller 25 would reach the short diameter of the cam 22. Thisadditional movement imparted to the arm 28 would allow the pawl 29 tofall into the next preceding tooth of the ratchet 21. The shaft 26 wouldthen be partially rotated to cause the elevator plate I0 to move theblanks 9 forward along the rods 8. By means of a knob 38, the spread ofthe fulcrum points in the link 3'! may be adjusted to change therelative position of the leading end of the blanks.

The separation of a blank from the stack of blanks 9 is accomplished bya vacuum nozzle or sucker 39. The latter is attached to a frame 40secured to a tubular cross .support that is rotatable in bearingscarried by the side rails 4, 4. This vacuum nozzle is caused to movethrough the are indicated in dotted lines in Figure 3, by the followingmeans. Mounted on the shaft 2| is a second cam 22 that is mounted on ayoked connecting rod 42 which is pivoted to an arm 43. This arm in turnis secured to the vacuum frame 40 which carries the nozzle. (See Figures1 and 3.)

For the purpose of alternately making and breaking the vacuum in thenozzle 39 to cause it to raise a blank from the stack 9 and then releaseit at the proper time, we have provided the following means. Mounted onthe shaft 2I are two cams 44 and 45. The cam 44 is in engagement with aroller 46 carried by the stem 41 that depends from a poppet valve 48resting on a conical seat 49 in a valve body 50 supported by the frameof the folding machine I. The valve stem projects downwardly through aboss 5| on said body to expose the roller 46 to the cam 44. A helicalspring 52 bears against the upper portion of the valve to hold theroller in normal engagement with the cam at all times. (See Fig. 13.)

The cam -is in engagement with a roller 53 carried by the stem 54 of apoppet valve 55 that engages a conical seat 56 in the valve body 50.This valve stem projects downwardly through a boss 51 on said body toexpose the roller 53 to the cam 45. The pressure of a helical spring 58upon-the valve 55 maintains the roller 53 in continuous engagement withthe cam.

The valve body is in communication with a vacuum pump (not shown)through a pipe 59.

. A tube 60 leads from the valve body to a hose 6! which is attached tothe nozzle frame 49.

The nozzle 39, when it contacts a blank in the stack 9 is under asufficient vacuum to raise the blanks from the pack, because at thattime the valve 48 is raised above its seat by the cam 44 to place thevacuum frame in communication with the vacuum pump through the pipe 59.The nozzle 39 is then caused to move through an are from its dotted lineposition illustrated in Figure 1, to present the blank to the feedcylinders soon to be described. At this point the drive shaft 2|,rotating further, will bring the cam 44 to a position to cause thespring 52 to close the valve 43, and the cam 45 to a position to raisethe valve above its seat. Air at atmospheric pressure will then beadmitted past the valve 55 to the nozzleor sucker 39, while the valve 43isv closed, to break the vacuum in the nozzle to release the blank at atime when it has presented the lower end of the blank to the Contactingthis cam is a roller 4| lower edges of the blanks to prevent more thanone being separated at one time from the stack 9. (See Figures 1 and3.)-

There are two flat springs'88, 68 secured to the cross bar 20 for thepurpose of bearing against the stack of blanks 9 to stabilize them whilethe transfer is being made from the nozzle 39 to the feed cylinders 82and 63. (See Figure 3.)

The feed cylinders 68, 83 are cup-shaped with a section removed toprovidean'opening for the nozzle 39 to pull the lower end of a blankwell into the pinch between said cylinders and the cylinders 62, 62.(See Figures 9 and 4.) A section is also removed from each one of thecylinders 62, 62, the circumference of their remaining peripheries beingsufficient to push the blank to a predetermined position on a horizontalplate 89 mounted in front of the cylinders in the frame I. 7

Fast on the shaft 85 is a gear l9 by which the shaft is rotated to drivethe feed cylinders 93. Also secured to the shaft I55 is a gear II thatmeshes with a gear I2 fast on the shaft 30 whereby, when the feedcylinders 83 are rotated, the feed cylinders 82 will be rotated in timedrelation with them. 1

The gear 70 meshes with an intermediate gear "I3 that in turn. mesheswith a small intermediate gear I I. The latter engages a large gear 113mounted on the shaft 2|. Thus, when the shaft HI is rotated, it willdrive the feed cylinders I32 and 63 in timed relation, through this geartrain. Two retard springs I9, 'IIisecured.

to a cross bar 15*, engagethe blankon the plate 99 to stabilize saidblank after the feed cylinders have completed their cycle.

The shaft 64 is mounted in spring-tensioned journal boxes 11 so that thetension between the feed cylinders 62 and. 03may be easily adjustedwhereby crooked and warped blanks may be fed between these cylinders tolie accurately upon the plate 69. Furthermore, because of the peculiardesign of the before described separating and feeding mechanism, anygrade, ,weight orkind of paper may be easily handled.

The nature and function of the transfer chains I8, I8 will now bedescribed. The purpose of these chains is to move the blanks from theplate 89 through the gumming station to the creasing box. On each end ofthe shaft 65 is a spiral gear I9 that meshes with a spiral gear 80 tothe hub of which a sprocket 8I is attached. Each' sprocket M. isarranged in the frame I with sprockets 82,83 and 84 to define with themthe corners of a parallelogram. There are two'sets of these sprockets,one on each side of the device;

and over the sprockets of each set there passes in a horizontal plane,an endlessroller-transfer chain Iii-heretofore referred to. Mounted onthe top of each chain is a series of gripper blocks 85'.

Each transfer chain is slides in. achain track 89, and is held inposition by a gib 81 (see Figure 4) a coiled spring 89. Also mounted oneach block 85,is, a block 90. These blocks 90 on'the two align the same.When the hinged part 88 of Each block 85 carries a hinged jaw part 88which is held in a normally closed position .by Y

each block 85 passes under a plate cam 9I fixedly secured in the frame 3above the tracks 86, the coil spring 89 is depressed to provide anopening in which the blank may be gripped. (See Figures 3, 10, Hand 12.)

Further movement of the chains I8, I8 causes the gripper blocks 85, 85to enter the corners of the blank which rests uponthe plate 69 under thesprings I6, I6, for the purpose of locating the same. When the hingedjaw parts 88 of the gripping blocks 85 have passed from under the platecam 9|, this blank will be accurately located by the blocks and securelygripped by them through the agency of the hinged parts 88. Being grippedin this manner, the blank is maintained in alignment at all times (seeFigures 10, 11 and 12). a

By these gripping blocks the blank is carried to a gumming cylinder 92mounted on the shaft 2i. Carried by this gumming cylinder is a seal pad93 and aback pad 94.

Since a different kind of gum is used on each one of the two pads 93 and94, it is necessary to provide two gum boxes 95 and 96, one on each ideof the shaft M. The object of these two gum boxes is to distribute athin film of gum to the respective pads, through means now to bedescribed. The gum box 95 contains the sealflap gum and the pad 93 isthe seal-flap pad, the gum box 90' containing the back-flap gum tosupply the back-flap pad 99. Mounted on cross shafts 91 and 91!journaled in the gum boxes 93 and 90, are two lower rolls 98 and 99respectively which revolve in these gum boxes. Pivotally secured to theroll shafts 91 and 91 are arms I00, I00, and IN, IIII respectively. (SeeFigures 2, 3 and 9.)

Carried by the outer ends of the arms I00, I00 are spring-tensionedbearings for a shaft I02 on which an upper roll I03 that contactstheroll 98, ismounted. Also mounted on the shaft I02, near the endsthereof, arecam followers I04, I04 that are adapted to engage cams I05and I 06 secured to the shaft 2 f. Compression springs I01, I01contained within inclined bosses I08, I08 on the glue box 95, bearagainst the outer ends of the arms I00, I00, and thus tend to press theroll I03 in engagement with the pads 93 and 94. However, when the lobesof the cams I05 and I06 engage the followers I04, I04, the roll I03 willbe moved out of the path of the pad 94.

Pivoted to a shaft I09 journaled in bearings I03, the lobes ofthe camsI05 and I08 will have engaged the followers I04, I04 to push that rollout of the path of the pad 94 so that it will not pick 'up any back-flapglue from the box 96.

- (See Figures 2, 3 'and;9.)

Qn' the other side of the shaft 2|, the arms IOI, IOIcarryspring-tensioned bearings H0, H0 for a shaft III on which an upperroll H2 is mounted. Also mounted on the shaft III, near the endsthereof,are cam followers II3, I I3 that are adapted to engage H4, H4respectively secured to the shaft '2I. Compression springs N5,- I I5contained Within inclined bosses H5, H6

on the glue box 95, bear against the outer ends of the arms IIII, II andthus tend to press the upper roll II2 into engagement with the gum pads93 and 94. However, when thelobes of the cams H4, H4 engage thefollowers H3, H3, the roll I I2 will be moved out of the path of the Dad93.

Pivoted to a shaft H6 journaled in bearings in the glue box 95, is ascraper blade 6 that bears against the roll 99 to control the thicknessof the film of glue deposited thereon. This glue is transferred to theupper roll H2 and by it to the pad 94. (See Figure 3.)

The depth of the engagement of the scraper blades I [19 and IIG with theglue on the respective rolls 98 and 99 is controlled by set screws H1,H1 carried by arms H8, H8 secured at their lower ends to the shafts I 09and I I5 respectively, the inner ends of said set screws engaging thefixed abutments provided by the spring-containing bosses I 08 and H3.

For the purpose of rotating the lower rolls 98 and 99, the followingmeans are provided. Fast on one end of the shaft 2I is a large gear II9which is in engagement with an idler gear I20, which in turn engages agear I2I on the shaft 91. Mounted on the stud with the gear 14 isanother idler gear I21! that engages a second gear I2I which in turnmeshes with a gear- I2I on the shaft 91. Therefore, when the shaft 2| isrotated to receive the gum pad cylinder 92, the lower rolls 98 and 99will also be rotated to pick up gum from their respective glue boxes anddeposit it on the upper rolls I03 and H2 respectively. (See Figure 9.)

The upper roll I 93 is driven from the shaft 91 by a gear I22 on thelatter which meshes with a gear I23 on the shaft I02 that' carries theroll I03.

The upper roll H2 is driven from the shaft 91 through an idler gear- I24which is in mesh with a gear I25 on the shaft 91' and a gear I29 on theshaft III to which the roll H2 is secured. This idler permits the rollII2 to be driven at a lower peripheral speed than the peripheral speedof the pad 94 so that the glue .may be deposited thereon through awiping action because of its peculiar consistency.

It will now be seen that the means provided for placing the kind of gumfrom one gum box upon the pad provided to receive it, without depositingthat type of gum upon the other pad, is unique. In brief, this result isaccomplished by camming an upper roll which receives gum from one gumbox, out of the path of the pad which receives gum from the other gumbox, and spring pressing the proper roll into engagement with itsrespective pads to deposit gum upon it when the lobes of its respectivecams have cleared their respective cam followers.'

Under our method of rolling the gum into the paper, it will notaccumulate in harmful wads at the ends of the seal flaps. Furthermore,the roll seal pads 93 and 94 extend over the edge of the papersufficiently to apply the gum all .the way over the edge of the sealflap.

Should no blank be fed through the mechanism, the pads 93 and 94 wouldplace gum on a cylinder I21 mounted on a cross shaft I28 and overwhichthe blank travels while being gummed. This gum must be removed becausethe blanks would otherwise adhere to the cylinder. For the purpose ofremoving most of thisgum from the cylinder I21 we have provided a bladeI29 which pro- 'jects upwardly against the cylinder from a cross bar I29The remainder of the gum is removed from the cylinder I21 by an engagingroll I39 mounted on a shaft I3I. This roll, running in water in a boxI32, moistens the remainder of the gum on the cylinder I21, while bladesI33 and I34, similar to blade I28, complete the removal of the gum,thereby presenting a clean cylinder to the oncoming blanks. (See Figure3.)

Since the blank tends to adhere to the pads 93 and 94, stripper bladesI35, I35 are provided to strip the leading edge of the blank from thepads. which contacts a roller I31 carried 'by an arm I38 pivoted at itslower end to the frame 3. A link I39 connects the arm E38 to an arm I49secured to a shaft I4I. Pinned to the shaft I4! are arms I42, I42 whichare caused to move in one direction by the cam i236; and in a reversedirection by a tension spring E43 connected be tween'the outer end ofthe arm H38 and the plunger bracket I44. Pivoted to blocks I45, 645secured to the cross plate 545, are arms Ml, E41. Pivotally secured toeach pair of arms M2, E l-l is astripper blade I35. In their downwardpositions the blades I35, I35 strip the freshly gummed blank from thepads 93 and 94;, after which they move upwardly and backwardly to clearthe freshly gummed surface of the blank. (See Figures 2, 3 and 8.) I

The gripper blocks 85 on the chains it. now

pass under a plate cam I48 to release the blank,

leaving the latter approximately located on the creasing box I49. Atthis time the gripper blocks 85 on the chains 18 will have passed overthe sprocket, completely out of range of the blank and have no furtheraction upon it. I

In order that the blank may be accurately'located over the creasing box49, the following mechanism is provided, as shown in Figures 7 and 8.Fast on the shaft 2I is a cam I58 in contact with a roller I5I carriedby an arm I52. This arm I52, which is pivoted at its lower end to theframe, is connected at its other end by a link I53 to an arm I54 on theshaft I55. Fixedly secured to this shaft I55 are two fingers I56, I56.A'tension spring I51 connected between the bearing for the shaft 2I andan arm I54, acts on said arm to move the notched ends of the fingersthrough an are against the recessed portions of the blank to accuratelylocate it over the creasing box. After it is so located, the cam I50will contact the roller I5I to cause these locating fingers, through thelinkagemechanism heretofore described, to be raised a sufficientdistance to clear the approaching blank, as shown by the dotted lines inFigure 8.

It is thus seen that our attachment for envelope folding machines easilyand correctly, separates the envelope blanks from the stack for an der,a seal-flap, gum roller and a back-flap, gum

roller, spring means for pressing said rollers into engagement with saidgumming cylinders to ap- Mounted on the shaft H is a cam I36 rollerclear of the seal-flap pad during the rota-' tion of the pad cylinder.

2. In a device of the type described, the combination with a frame, agummi'ng cylinder, means for rotating said cylinder, means for feedingenvelope blanks to the latter, a seal-flap pad and a back-flap padsecured to the periphery of said cylinder, a gum box on each side ofsaid cylinder, one of said boxes containing a sealfiap gum and the othera back-flap gum, a roll rotatable in each gum box, an arm pivotallysecured at its lower end in said box, for movement at its upper endtoward and away from the pad cylinder, a gumming roll carried by theupper end of each arm, and being in contact with its respective gum boxroll, a spring urging each arm forwardly to contact its upper roll witha respective seal pad to apply gum thereto from its respective gum box,a cam follower carried by each arm, and a cam adapted to be rotated intimed relation with the summing cylinder for engagement with eachfollower to hold its respec: tive'upper roll out of engagement with thepad to which gum is applied from the opposite box during the rotation ofthe pad cylinder.

3. In a device of the type described, the combination with a frame, agumming cyli der,-

means for rotating said cylinder, means for eeding envelope blanks tothe latter, a seal pad secured to the periphery of said-cylinder toapply {rum to the seal flaps of said blanks, said pad overlapping theseal-flap edges of the blanks when applying gum thereto, a cylindermounted in said frame below the pad cylinder to receive the excess gumtherefrom, a blade in contact with the last named cylinder to scrape thegreater part of the gum therefrom, a water box, a roll in said box incontact with said cylinder to moisten the remainder of the gum thereon,and blade means in contact with said cylinder to remove the remainder ofthe gum therefrom.

4. In a device of the type described,- the combination with a frame, agumming cylinder, means for rotating said cylinder, means for feedingenvelope blanks to said cylinder, a seal-flap pad and a back-flap padcarried by said cylinder for applying gum to said blanks, a stripperblade adapted to strip the leading edges of the blanks from the backpa'd, and means for moving said stripper blade forwardly and upwardlyout of contact withnewly gummed surfaces of the blanks.

5. In a device of the type described, the combination with a frame, agumming cylinder, means for rotating said cylinder, means for feedingblanks to said cylinder and moving them beyond it, a stripper bladeadapted to strip the leading edges of the blanks from the gummingcylinder, a creasing box, a shaft journaled' in said frame near saidbox,and locating fingers secured to said shaft to contact the corners ofeach blank afterit is placed approximately on the creasing box, toproperly locate said blank on the box.

6. In a device of the type described, the combination with a frame, agumming cylinder, means for rotating said cylinder, means for feedingenvelopes to the latter, a seal pad and a back pad secured to theperiphery of, said cylinder, a seal flap gum roller and a back flap g'umroller, means for pressing said rollers into engagement with saidgumming cylinders to apply gum to the pads, and means adapted to berotated in timed relation with the gumming cylinder for holding the sealflap gum roller out of the path of the back-flap pad and the back gumroller clear of the seal-flap pad during the rotation of the padcylinder. a

OMER G. DREHER. CHARLES '1. ARNOLD.

